int load_clusters(char *filename, struct cluster_t **arr)
{
    assert(arr != NULL);

    // TODO

    //nacitanie suboru a kontrola nacitaniashallo
    FILE *fp = fopen(filename, "r");
    if ( fp == NULL)
    {
        fprintf(stderr, "Nepodarilo sa nacitat subor\n");
        return -1;
    }

    // nacitanie count=N
    const int N;
    char string[20];
    fgets(string, 20, fp);
    sscanf(string, "count=%d", &N);

    // alokovanie miesta pre vsetky zhluky
    *arr = malloc(sizeof(struct cluster_t) * N);

    // loop na nacitanie ostatnych objektov
    int i;
    for ( i = 0; i < N; i++ )
    {
        fgets(string, 20, fp);
        struct obj_t obj;
        sscanf(string, "%d %f %f", &obj.id, &obj.x, &obj.y);
        init_cluster(c, 1);
        append_cluster(c, obj);

        // zaradenie zhluku do bola zhlukov
        *arr->c[i] = c;
    }
}





void init_cluster(struct cluster_t *c, int cap)
{
    assert(c != NULL);
    assert(cap >= 0);

    // TODO

    // pointer na NULL u pole objektu
    if ( c->obj == NULL)
    {
        c->capacity = 0;
        fprintf(stderr, "Nealokovana pamat\n");
    }

    // declaracia capacity zhluku a velkosti zhluku
    c->capacity = cap;
    c->size = 0;

    // alokovanie pamate pre zhluk
    c->obj = malloc(sizeof(struct obj_t) * cap);
}